7/3d=21

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Solution for 7/3d=21 equation: 



7/3d=21

We move all terms to the left:

7/3d-(21)=0



Domain of the equation: 3d!=0

d!=0/3

d!=0

d∈R



We multiply all the terms by the denominator


-21*3d+7=0

Wy multiply elements

-63d+7=0

We move all terms containing d to the left, all other terms to the right

-63d=-7

d=-7/-63

d=1/9

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